MFC: 279098

MFC: 279098

sfxge: allow TX and RX queue limits to be changed

Before the common code had hard coded limits on the IDs RXQs and TXQs could
be created with which were suited for the Windows driver with VMQ, and so
would prevent queues with IDs greater than or equal to 259 (for TXQs) or 768
(for RXQs) from being created. This change allows the limits to be set in
efsys.h, so that all 1024 queues can be created during new manftest tests.
Also, the descriptor cache sizes were also hard coded to values suited to
the smaller queue counts, and so it was necessary to make them configurable
as well.

Submitted by:   Mark Spender <mspender at solarflare.com>
Sponsored by:   Solarflare Communications, Inc.
Approved by:    gnn (mentor)

git-svn-id: svn://svn.freebsd.org/base/stable/10@280562 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f